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An Implantable System For Chronic In Vivo Electromyography
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An implantable pressure sensing system with electromechanical interrogation scheme.

Albert Kim, C R Powell, Babak Ziaie

    IEEE Transactions on Bio-Medical Engineering
    |May 8, 2014
    PubMed
    Summary

    This study introduces an implantable pressure sensor powered by sound vibrations. It uses acoustic energy harvesting and a pressure-sensitive inductor for wireless, accurate pressure monitoring in vivo.

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    Area of Science:

    • Biomedical Engineering
    • Acoustic Energy Harvesting
    • Implantable Sensors

    Background:

    • Inductive powering of implantable devices suffers from limited range and misalignment sensitivity.
    • Existing pressure sensing systems often require complex external circuitry and invasive procedures.

    Purpose of the Study:

    • To develop a novel implantable pressure sensing system powered by acoustic vibrations.
    • To overcome limitations of inductive powering in implantable medical devices.
    • To enable wireless, accurate, and robust pressure monitoring.

    Main Methods:

    • A piezoelectric cantilever converts acoustic vibrations into electrical power for a capacitor.
    • Stored electrical energy is discharged through a pressure-sensitive LC tank.
    • The LC tank's resonant frequency, modulated by pressure-induced inductor changes, is detected wirelessly.

    Main Results:

    • The system achieved a pressure sensitivity of 1 kHz/cm H2O.
    • Demonstrated minimal misalignment sensitivity for both acoustic powering (26% drop at 90°) and RF reception (60% drop at 90°).
    • Successful in vitro and in vivo (swine bladder) testing of the prototype sensor.

    Conclusions:

    • Acoustic vibration-powered implantable pressure sensors offer enhanced range and simplified circuitry.
    • The developed system provides a promising alternative for wireless in-body pressure monitoring.
    • This technology has potential applications in various medical fields requiring continuous pressure surveillance.